2001 yz 125 build

yz125

I bought a 2001 yz 125 for $700. Plan to tear it down and see what's going on inside this baby. Depending on how bad the engine is I'll ether keep it and have it be my race bike for next season or sell it and try to make a couple hundred and get a little better one. I bought the bike like this with a box of parts along with it. 

 

43502.jpeg

No offense but you over paid. A good assembled runner is a $850.00 bike in spring, a $700.00 bike off season in 2017.

Yeah I did a little but it's fine with me because most of the bikes like this that run sell for around $1,400 in my area. Plus it makes things easy when I have a motorcycle shop to use. I like working on bikes and will have something to do when I get bored this winter. I can get this bike to look and run like new without spending much money. 

 

 

IMG_20171028_150640339.thumb.jpg.390c0e8b7eb522c10bc6b9f97e525f98.jpg
 

Edited by Josh the squash

I got the bike to start today. The wudruff key that holds the flywheel was broken so I made a makeshift one out of aluminium real quick just to see if the bike ran. The bike fired up 3rd kick. when I took the engine out and seen that the piston has been seized but the previous owner just threw a new ring on it. Lololol figured this would happen. Luckily it has a sleeve in it so getting it repaired is much less $$$. I felt the rod, and surprisingly it had no up and down play in it and the flywheel side of the crank didn't have any play so there could be a chance the crank bearings aren't trash. Next is to inspect the clutch. 

IMG_20171028_142836_921.jpg

On November 4, 2017 at 10:01 PM, William1 said:

No offense but you over paid. A good assembled runner is a $850.00 bike in spring, a $700.00 bike off season in 2017.

Friendly reminder just to keep in mind the average price for a bike will be different depending where someone lives. For example an 01 yz125 where I am would be about 1200-1400. As for the op keep us updated with what you do with the bike, always fun to follow a rebuild thread!

1 hour ago, yzyamaha250 said:

Friendly reminder just to keep in mind the average price for a bike will be different depending where someone lives. For example an 01 yz125 where I am would be about 1200-1400. As for the op keep us updated with what you do with the bike, always fun to follow a rebuild thread!

We are working in USD, not CDN. Also, bike was a non-runner.

Yeah I realize, I just meant that for me a 5 hour drive means the difference of $4000 for a 2015 yz250f compared to $5500 for a 2014. So I was only suggesting that prices can vary largely even in the same country or state. Sorry for the confusion haha.

Got a lot done today. Took some nasty looking parts and took them to the gunk tank. Then greased and packed the linkage bearings. 

IMG_20171106_171340627.jpg

IMG_20171106_173508593.jpg

IMG_20171106_173948750.jpg

IMG_20171106_180644382.jpg

IMG_20171106_180658974.jpg

IMG_20171106_192730297.jpg

IMG_20171106_181237927.jpg

IMG_20171106_181213376.jpg

IMG_20171106_201322758.jpg

IMG_20171106_201858552.jpg

Good for you man!  Looking great!   Your lucky those crank bearings are good!  I'm going trough a full engine rebuild on my 01 cr125  

That will be a great race bike someday (soon) at the rate your going!  Whereabouts are you in Michigan?  Im close to Windsor Ontario...near the border.

Btw that swing arm looks like its for a newer bike...What do you think?

11 hours ago, Slicing-Air said:

Good for you man!  Looking great!   Your lucky those crank bearings are good!  I'm going trough a full engine rebuild on my 01 cr125  

That will be a great race bike someday (soon) at the rate your going!  Whereabouts are you in Michigan?  Im close to Windsor Ontario...near the border.

Btw that swing arm looks like its for a newer bike...What do you think?

Thanks! The swingarm could be off of a newer bike but I think its the original but I could be wrong.  the previous owner said he built the bike from the frame up so some of the parts could be off of newer or older bikes. The swingarm cleaned up very nicely. Good luck on your cr125. I will be cleaning up the rear wheel plus greasing the wheel bearings, truing the wheel and will be posting pictures of that tonight.

1 hour ago, Josh the squash said:

Thanks! The swingarm could be off of a newer bike but I think its the original but I could be wrong.  the previous owner said he built the bike from the frame up so some of the parts could be off of newer or older bikes. The swingarm cleaned up very nicely. Good luck on your cr125. I will be cleaning up the rear wheel plus greasing the wheel bearings, truing the wheel and will be posting pictures of that tonight.

Awesome sounds great!  

Mind if i post a few pictures of my project build cr125?  I understand sometimes its a pain if someone else uses your topic to post their junk.😁  Let me know thx

2 hours ago, Slicing-Air said:

Awesome sounds great!  

Mind if i post a few pictures of my project build cr125?  I understand sometimes its a pain if someone else uses your topic to post their junk.😁  Let me know thx

Yeah that's fine I'd like to see it 

 

Ok...I have a lot of work to do lol!  I ordered a whole new engine rebuild kit, GPI oversized rads, new back tire, already did all the bearings, new air filter, and i ordered a new pro circuit 304 silencer to go with my pc pipe.  I will post more pictures when i am done!

IMG_6788.jpg

IMG_6789.jpg

IMG_6787.jpg

IMG_6790.jpg

Cleaned up the back wheel and the last person who tried to grease the wheel bearings put grease all over but never actually took the seal off so none of the grease was on the bearings😂. I get them packed and the wheel looking nice. And also cleaned off the pipe and silencer.

IMG_20171109_160052244.jpg

IMG_20171109_162731033.jpg

IMG_20171109_163240977.jpg

IMG_20171109_163622566.jpg

IMG_20171109_170053181.jpg

IMG_20171109_165529667.jpg

IMG_20171109_171758385.jpg

15102685913411199913722.jpg

Nice!  Thorough cleaning job man!   Keep posting pictures!  Have you ever had the pro circuit 304 shorty?

11 hours ago, Slicing-Air said:

Nice!  Thorough cleaning job man!   Keep posting pictures!  Have you ever had the pro circuit 304 shorty?

i have not, from what i have heard they are perfect on a 125.

4 hours ago, Josh the squash said:

i have not, from what i have heard they are perfect on a 125.

Cool, well i guess i will find out!

Well I have some bad news, but everything is fixable. The meat head that sold me this bike lied and the bike is really a 1999. I looked it the engine and frame numbers. Going to probably need a new crank, which I was ready to do anyways and I found a bunch of metal shaving from the clutch case where a bolt had came lose and started cutting away at the aluminum. I will be able to fix everything and at least the clutch and transmission are good. 

IMG_2215.JPG

IMG_2220.JPG

IMG_2221.JPG

IMG_2222.JPG

IMG_2223.JPG

IMG_2224.JPG

Ohh, that's too bad. How did it come loose?  I guess the idiot in the engine who tried to rebuild it didn't like tightening things down?  The guy who had done mine put lock tight on every single bolt.  I'm like hitting the wrench that's on 8mm bolts with by palm trying to losen them!  One extreme to the other! lol   

Here is what my bike looked like about 3 months ago...When i'm done this overhaul i think (hope) it will look/perform even better;(: 

IMG_5916.jpg.f0d9cf9f4839770db31d2c5e56947be6.jpgIMG_5909.jpg.bcfde11dc8ba6feb2cf908bc29bb8ee6.jpg

 

  My left case is getting welded right now. Case saver chain guard thingy snapped off along with the mounting aluminum.  Thankfully my brother had a 01 cr125 as well and same problem with his; he kept the guard so i can use it now! :applause:   Also my drain bolt is stripped so i will have to drill/rethread that as well.   IMG_6047.jpg.0b0234c9b228c6120b57aba53d159a22.jpg

 

These old bikes ah?  I guess its kind of fun and a good experience but it gets expensive ordering so many parts!  

 

 

Anyway, good look with the rebuild and keep us informed!

Cheers!

 

 

 

 

 

Edited by Slicing-Air

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now